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C99 compatiblity fixes

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Apply upstream patches from the portable OpenSSH project to fix
C99 compatibility issues in the configure script.

For the PAM agent integration, apply a custom downstream fix,
as the proposed upstream changes have not been merged yet.

Related to:

  <https://fedoraproject.org/wiki/Changes/PortingToModernC>
  <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>
This commit is contained in:
Florian Weimer 2023-04-12 12:07:21 +02:00
parent e3597c03f1
commit d5591fb5ab
5 changed files with 378 additions and 2 deletions
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26
openssh-configure-c99-1.patch Normal file
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@ -0,0 +1,26 @@
commit 40b0a5eb6e3edfa2886b60c09c7803353b0cc7f5
Author: Sam James <sam@gentoo.org>
Date: Sun Nov 6 04:47:35 2022 +0000
configure.ac: Add <pty.h> include for openpty
Another Clang 16ish fix (which makes -Wimplicit-function-declaration
an error by default). github PR#355.
See: 2efd71da49b9cfeab7987058cf5919e473ff466b
See: be197635329feb839865fdc738e34e24afd1fca8
diff --git a/configure.ac b/configure.ac
index 1e77ecfc..1866aea5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2373,6 +2373,9 @@ if test ! -z "$check_for_openpty_ctty_bug"; then
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
+#ifdef HAVE_PTY_H
+# include <pty.h>
+#endif
#include <sys/fcntl.h>
#include <sys/types.h>
#include <sys/wait.h>

47
openssh-configure-c99-2.patch Normal file
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@ -0,0 +1,47 @@
commit 32fddb982fd61b11a2f218a115975a87ab126d43
Author: Darren Tucker <dtucker@dtucker.net>
Date: Mon Nov 7 10:39:01 2022 +1100
Fix setres*id checks to work with clang-16.
glibc has the prototypes for setresuid and setresgid behind _GNU_SOURCE,
and clang 16 will error out on implicit function definitions, so add
_GNU_SOURCE and the required headers to the configure checks. From
sam at @gentoo.org via bz#3497.
diff --git a/configure.ac b/configure.ac
index 4bf758ac..e172540a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -863,7 +863,8 @@ int main(void) { if (NSVersionOfRunTimeLibrary("System") >= (60 << 16))
check_for_openpty_ctty_bug=1
dnl Target SUSv3/POSIX.1-2001 plus BSD specifics.
dnl _DEFAULT_SOURCE is the new name for _BSD_SOURCE
- CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE=600 -D_BSD_SOURCE -D_DEFAULT_SOURCE"
+ dnl _GNU_SOURCE is needed for setres*id prototypes.
+ CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE=600 -D_BSD_SOURCE -D_DEFAULT_SOURCE -D_GNU_SOURCE"
AC_DEFINE([BROKEN_CLOSEFROM], [1], [broken in chroots on older kernels])
AC_DEFINE([PAM_TTY_KLUDGE], [1],
[Work around problematic Linux PAM modules handling of PAM_TTY])
@@ -2168,8 +2169,9 @@ AC_CHECK_FUNCS([setresuid], [
AC_MSG_CHECKING([if setresuid seems to work])
AC_RUN_IFELSE(
[AC_LANG_PROGRAM([[
-#include <stdlib.h>
#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
]], [[
errno=0;
setresuid(0,0,0);
@@ -2191,8 +2193,9 @@ AC_CHECK_FUNCS([setresgid], [
AC_MSG_CHECKING([if setresgid seems to work])
AC_RUN_IFELSE(
[AC_LANG_PROGRAM([[
-#include <stdlib.h>
#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
]], [[
errno=0;
setresgid(0,0,0);

41
openssh-configure-c99-3.patch Normal file
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@ -0,0 +1,41 @@
commit 5eb796a369c64f18d55a6ae9b1fa9b35eea237fb
Author: Harmen Stoppels <harmenstoppels@gmail.com>
Date: Thu Oct 13 16:08:46 2022 +0200
Fix snprintf configure test for clang 15
Clang 15 -Wimplicit-int defaults to an error in C99 mode and above.
A handful of tests have "main(..." and not "int main(..." which caused
the tests to produce incorrect results.
diff --git a/configure.ac b/configure.ac
index de60a1b1..165c49de 100644
--- a/configure.ac
+++ b/configure.ac
@@ -713,7 +713,7 @@ case "$host" in
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <mach-o/dyld.h>
#include <stdlib.h>
-main() { if (NSVersionOfRunTimeLibrary("System") >= (60 << 16))
+int main() { if (NSVersionOfRunTimeLibrary("System") >= (60 << 16))
exit(0);
else
exit(1);
@@ -4259,7 +4259,7 @@ dnl test snprintf (broken on SCO w/gcc)
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_SNPRINTF
-main()
+int main()
{
char buf[50];
char expected_out[50];
@@ -4276,7 +4276,7 @@ main()
exit(0);
}
#else
-main() { exit(0); }
+int main() { exit(0); }
#endif
]])], [ true ], [ AC_DEFINE([BROKEN_SNPRINTF]) ],
AC_MSG_WARN([cross compiling: Assuming working snprintf()])

17
openssh.spec
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@ -54,7 +54,7 @@
Summary: An open source implementation of SSH protocol version 2
Name: openssh
Version: %{openssh_ver}
Release: %{openssh_rel}%{?dist}.1
Release: %{openssh_rel}%{?dist}.2
URL: http://www.openssh.com/portable.html
#URL1: https://github.com/jbeverly/pam_ssh_agent_auth/
Source0: ftp://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-%{version}.tar.gz
@ -106,6 +106,7 @@ Patch306: pam_ssh_agent_auth-0.10.2-compat.patch
Patch307: pam_ssh_agent_auth-0.10.2-dereference.patch
# https://bugzilla.redhat.com/show_bug.cgi?id=2070113
Patch308: pam_ssh_agent_auth-0.10.4-rsasha2.patch
Patch309: pam_ssh_agent-configure-c99.patch
#https://bugzilla.mindrot.org/show_bug.cgi?id=1641 (WONTFIX)
Patch400: openssh-7.8p1-role-mls.patch
@ -236,6 +237,10 @@ Patch1004: openssh-8.7p1-gssapi-auth.patch
# https://github.com/openssh/openssh-portable/pull/323
Patch1006: openssh-8.7p1-negotiate-supported-algs.patch
Patch1007: openssh-configure-c99-1.patch
Patch1008: openssh-configure-c99-2.patch
Patch1009: openssh-configure-c99-3.patch
# downstream only
# we skip some ssh-rsa/ssh-dss tests to make native test suite pass
#Patch1100: openssh-8.8p1-skip-some-tests.patch
@ -314,7 +319,7 @@ Requires: openssh = %{version}-%{release}
%package -n pam_ssh_agent_auth
Summary: PAM module for authentication with ssh-agent
Version: %{pam_ssh_agent_ver}
Release: %{pam_ssh_agent_rel}.%{openssh_rel}%{?dist}.1
Release: %{pam_ssh_agent_rel}.%{openssh_rel}%{?dist}.2
License: BSD
%description
@ -375,6 +380,7 @@ pushd pam_ssh_agent_auth-pam_ssh_agent_auth-%{pam_ssh_agent_ver}
%patch305 -p2 -b .psaa-agent
%patch307 -p2 -b .psaa-deref
%patch308 -p2 -b .rsasha2
%patch309 -p1 -b .psaa-configure-c99
# Remove duplicate headers and library files
rm -f $(cat %{SOURCE5})
popd
@ -441,6 +447,10 @@ popd
%patch1006 -p1 -b .negotiate-supported-algs
%patch1007 -p1 -b .configure-c99-1
%patch1008 -p1 -b .configure-c99-2
%patch1009 -p1 -b .configure-c99-3
#%patch1100 -p1 -b .skipsshrsadsstests
%patch100 -p1 -b .coverity
@ -749,6 +759,9 @@ test -f %{sysconfig_anaconda} && \
%endif
%changelog
* Wed Apr 12 2023 Florian Weimer <fweimer@redhat.com> - 9.0p1-14.2
- C99 compatiblity fixes
* Tue Mar 14 2023 Timothée Ravier <tim@siosm.fr> - 9.0p1-14
- Make sshd & sshd@ units want ssh-host-keys-migration.service

249
pam_ssh_agent-configure-c99.patch Normal file
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@ -0,0 +1,249 @@
configure.ac: Improve C99 compatibility
Future compilers will not support implicit declarations and implicit
ints by default. This means that configure probes which rely on them
will fail unconditionally, without actually testing anything.
The changes mostly mirror what has been implemented in the openssh
repository, but had to be adapted somewhat because of drift between
the two versions of configure.ac.
Sam James has submitted similar fixes upstream:
<https://github.com/jbeverly/pam_ssh_agent_auth/pull/41>
diff --git a/configure.ac b/configure.ac
index 6496679..d927b62 100644
--- a/configure.ac
+++ b/configure.ac
@@ -500,10 +500,10 @@ int main(void) { exit(0); }
AC_DEFINE(HAVE_BUNDLE, 1, [Define if your system uses bundles instead of ELF shared objects])
AC_MSG_CHECKING(if we have working getaddrinfo)
AC_TRY_RUN([#include <mach-o/dyld.h>
-main() { if (NSVersionOfRunTimeLibrary("System") >= (60 << 16))
- exit(0);
+int main(void) { if (NSVersionOfRunTimeLibrary("System") >= (60 << 16))
+ return 0;
else
- exit(1);
+ return 1;
}], [AC_MSG_RESULT(working)],
[AC_MSG_RESULT(buggy)
AC_DEFINE(BROKEN_GETADDRINFO, 1, [getaddrinfo is broken (if present)])],
@@ -917,8 +917,8 @@ AC_SUBST(LDFLAGS_SHARED)
AC_MSG_CHECKING(compiler and flags for sanity)
AC_RUN_IFELSE(
[AC_LANG_SOURCE([
-#include <stdio.h>
-int main(){exit(0);}
+#include <stdlib.h>
+int main(void){exit(0);}
])],
[ AC_MSG_RESULT(yes) ],
[
@@ -951,9 +951,9 @@ int main(int argc, char **argv) {
strncpy(buf,"/etc", 32);
s = dirname(buf);
if (!s || strncmp(s, "/", 32) != 0) {
- exit(1);
+ return 1;
} else {
- exit(0);
+ return 0;
}
}
]])],
@@ -1102,7 +1102,7 @@ AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <sys/types.h>
#include <dirent.h>
-int main(void){struct dirent d;exit(sizeof(d.d_name)<=sizeof(char));}
+int main(void){struct dirent d;return sizeof(d.d_name)<=sizeof(char);}
]])],
[AC_MSG_RESULT(yes)],
[
@@ -1327,8 +1327,10 @@ AC_CHECK_FUNCS(setresuid, [
AC_MSG_CHECKING(if setresuid seems to work)
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
+#define _GNU_SOURCE
#include <stdlib.h>
#include <errno.h>
+#include <unistd.h>
int main(){errno=0; setresuid(0,0,0); if (errno==ENOSYS) exit(1); else exit(0);}
]])],
[AC_MSG_RESULT(yes)],
@@ -1344,8 +1346,10 @@ AC_CHECK_FUNCS(setresgid, [
AC_MSG_CHECKING(if setresgid seems to work)
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
+#define _GNU_SOURCE
#include <stdlib.h>
#include <errno.h>
+#include <unistd.h>
int main(){errno=0; setresgid(0,0,0); if (errno==ENOSYS) exit(1); else exit(0);}
]])],
[AC_MSG_RESULT(yes)],
@@ -1384,7 +1388,7 @@ if test "x$ac_cv_func_snprintf" = "xyes" ; then
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <stdio.h>
-int main(void){char b[5];snprintf(b,5,"123456789");exit(b[4]!='\0');}
+int main(void){char b[5];snprintf(b,5,"123456789");return b[4]!='\0';}
]])],
[AC_MSG_RESULT(yes)],
[
@@ -1418,7 +1422,7 @@ int x_snprintf(char *str,size_t count,const char *fmt,...)
int main(void)
{
char x[1];
- exit(x_snprintf(x, 1, "%s %d", "hello", 12345) == 11 ? 0 : 1);
+ return x_snprintf(x, 1, "%s %d", "hello", 12345) == 11 ? 0 : 1;
} ]])],
[AC_MSG_RESULT(yes)],
[
@@ -1467,7 +1471,8 @@ AC_MSG_CHECKING([for (overly) strict mkstemp])
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <stdlib.h>
-main() { char template[]="conftest.mkstemp-test";
+#include <unistd.h>
+int main(void) { char template[]="conftest.mkstemp-test";
if (mkstemp(template) == -1)
exit(1);
unlink(template); exit(0);
@@ -1492,10 +1497,14 @@ if test ! -z "$check_for_openpty_ctty_bug"; then
AC_MSG_CHECKING(if openpty correctly handles controlling tty)
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
+#include <stdlib.h>
#include <stdio.h>
#include <sys/fcntl.h>
#include <sys/types.h>
#include <sys/wait.h>
+#ifdef HAVE_PTY_H
+#include <pty.h>
+#endif
int
main()
@@ -1543,6 +1552,7 @@ if test "x$ac_cv_func_getaddrinfo" = "xyes" && \
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <stdio.h>
+#include <stdlib.h>
#include <sys/socket.h>
#include <netdb.h>
#include <errno.h>
@@ -1748,6 +1758,7 @@ AC_TRY_LINK_FUNC(RAND_add, AC_DEFINE(HAVE_OPENSSL, 1,
AC_MSG_CHECKING([OpenSSL header version])
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
+#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <openssl/opensslv.h>
@@ -1794,12 +1805,12 @@ int main(void) {
fd = fopen(DATA,"w");
if(fd == NULL)
- exit(1);
+ return 1;
if ((rc = fprintf(fd ,"%x (%s)\n", SSLeay(), SSLeay_version(SSLEAY_VERSION))) <0)
- exit(1);
+ return 1;
- exit(0);
+ return 0;
}
]])],
[
@@ -1829,7 +1840,7 @@ AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <string.h>
#include <openssl/opensslv.h>
-int main(void) { exit(SSLeay() == OPENSSL_VERSION_NUMBER ? 0 : 1); }
+int main(void) { return SSLeay() == OPENSSL_VERSION_NUMBER ? 0 : 1; }
]])],
[
AC_MSG_RESULT(yes)
@@ -2598,7 +2609,7 @@ dnl test snprintf (broken on SCO w/gcc)
#include <stdio.h>
#include <string.h>
#ifdef HAVE_SNPRINTF
-main()
+int main(void)
{
char buf[50];
char expected_out[50];
@@ -2611,11 +2622,11 @@ main()
strcpy(expected_out, "9223372036854775807");
snprintf(buf, mazsize, "%lld", num);
if(strcmp(buf, expected_out) != 0)
- exit(1);
- exit(0);
+ return 1;
+ return 0;
}
#else
-main() { exit(0); }
+int main(void) { return 0; }
#endif
]])], [ true ], [ AC_DEFINE(BROKEN_SNPRINTF) ],
AC_MSG_WARN([cross compiling: Assuming working snprintf()])
@@ -2746,11 +2757,11 @@ AC_CACHE_CHECK([for msg_accrights field in struct msghdr],
int main() {
#ifdef msg_accrights
#error "msg_accrights is a macro"
-exit(1);
+return 1;
#endif
struct msghdr m;
m.msg_accrights = 0;
-exit(0);
+return 0;
}
])],
[ ac_cv_have_accrights_in_msghdr="yes" ],
@@ -2773,11 +2784,11 @@ AC_CACHE_CHECK([for msg_control field in struct msghdr],
int main() {
#ifdef msg_control
#error "msg_control is a macro"
-exit(1);
+return 1;
#endif
struct msghdr m;
m.msg_control = 0;
-exit(0);
+return 0;
}
])],
[ ac_cv_have_control_in_msghdr="yes" ],
@@ -2791,7 +2802,7 @@ if test "x$ac_cv_have_control_in_msghdr" = "xyes" ; then
fi
AC_CACHE_CHECK([if libc defines __progname], ac_cv_libc_defines___progname, [
- AC_TRY_LINK([],
+ AC_TRY_LINK([#include <stdio.h>],
[ extern char *__progname; printf("%s", __progname); ],
[ ac_cv_libc_defines___progname="yes" ],
[ ac_cv_libc_defines___progname="no" ]
@@ -2871,7 +2882,7 @@ if test "x$ac_cv_have_getopt_optreset" = "xyes" ; then
fi
AC_CACHE_CHECK([if libc defines sys_errlist], ac_cv_libc_defines_sys_errlist, [
- AC_TRY_LINK([],
+ AC_TRY_LINK([#include <stdio.h>],
[ extern const char *const sys_errlist[]; printf("%s", sys_errlist[0]);],
[ ac_cv_libc_defines_sys_errlist="yes" ],
[ ac_cv_libc_defines_sys_errlist="no" ]
@@ -2884,7 +2895,7 @@ fi
AC_CACHE_CHECK([if libc defines sys_nerr], ac_cv_libc_defines_sys_nerr, [
- AC_TRY_LINK([],
+ AC_TRY_LINK([#include <stdio.h>],
[ extern int sys_nerr; printf("%i", sys_nerr);],
[ ac_cv_libc_defines_sys_nerr="yes" ],
[ ac_cv_libc_defines_sys_nerr="no" ]